Russia and Ukraine flashpoint

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Stephen Wright, a drone technology developer, told Insider that the new tactic won't prove useful for Russia, at least against drone attacks.

"I can see that these 'block ships' could be useful against a different kind of attack, perhaps a large ship being hijacked and rammed into the bridge, or even manned submarines," he said. "But against a weapon as small and agile as the sea drones that we have seen though? They won't stop that."

Russia Sinking Its Ships in Desperate Bid to Thwart Sea Drones: Ukraine